Calling it so and thus assigning it as the cause for failure is due to A lack of understanding.

Regards.G.

Graham:

Your level of understanding "astounds" me! Unfortunately, you missed teaching Dan last time he was down the street from you. Luckily for you, he will be back in your neighborhood in the near future. You should extend an invitation to him to attend one of your classes so that he can learn about his failures and lack of understanding. Please video tape that class and post on Youtube.